Chapter8 - Volcanic Activity 8 Mt Unzen 1991 • Japan has...

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Unformatted text preview: Volcanic Activity 8 Mt Unzen, 1991 • Japan has 19 active volcanoes. • One of these, Mt Unzen erupted 200 years ago killing 15,000 people. • 200 years later, it erupted again, but authorities had issued warnings and lives were spared • Harry Glicken was one of the scientists who was killed in the Mt Unzen eruption having escaped the Mount St Helens eruption in 1980 Volcanic Hazards • 50-60 volcanoes erupt every year; 2-3 eruptions occur in United States (mostly Alaska) each year • In the past 100 years 100,00 people have been killed • Countries with volcanic hazards include Japan, Mexico, Phillipines, Indonesia and U.S (Alaska, Hawaii, Pacific Northwest) Volcanism and Volcanoes • Directly related to plate tectonics • As spreading/sinking lithosphere interacts with earth materials, magma or molten rock with water vapor and carbon dioxide is produced • Magma emerging from the earth onto surface is called lava • Two thirds of the volcanoes are located in the “ Ring of Fire ” in the Pacific Ocean Types of Volcanoes • Shield • Composite or stratovolcano • Volcanic Dome • Cinder cone Largest volcanoes; commonly found in Iceland, Indian Ocean, tallest...
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Chapter8 - Volcanic Activity 8 Mt Unzen 1991 • Japan has...

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